The warlock’s Felhunter pet is designed to take o

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A void-walker means sacrifice,[link widoczny dla zalogowanych], which is a damage shield similar to Power Word: Shield. Often a Warlock with a Void-walker out will be able to summon another through talents almost instantly, so you have [link widoczny dla zalogowanych] to be wary that they have another shield.
If a warlock has an imp out, you should laugh and kill him quickly. Although an Imp that is boosted by Black Book can output a fair bit of damage, you should be able to survive through it and kill the Warlock with mana to spare.
Focus all your damage on the Warlock, always have him DoTed, and use Mind Blast whenever you can. Warlocks generally have high HP, so they can take a while to bring down, but as long as you keep your self Shielded and use Flash Heal when you need to you should come out on top.
The warlock’s Felhunter pet is designed to take out casters,[link widoczny dla zalogowanych], and as such is a very difficult battle for a priest to fight. The strategy remains the same though - try and bring them down before your mana runs out. Try and time you fears to hit both the pet and the warlock.
If they get low,[link widoczny dla zalogowanych], make sure they can’t heal. Their heal only takes 1.5 seconds to cast, so make sure you don’t miss your opportunity to Silence. Once you have them at this point, Mind Blast and Mind Flay, and try and finish them off. If Silence wears off and they can heal, you are in big trouble.